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<!DOCTYPE html> <html> <head> <title>Title of the document</title> </head> <body> <h1 id="elemId">Welcome to W3Docs</h1> <script> elemId.addEventListener("welcome", function(event) { alert(event.detail.name); }); elemId.dispatchEvent(new CustomEvent("welcome", { detail: { name: "W3Docs" } })); </script> </body> </html>